Revision history [back]

Chris Your question raises many questions. I have worked in Mali but my experience may not be relevant It may be appropriate to find out the reason for the problems with the existing pumps before drilling new boreholes or ordering new pumps Which part of northern Mali is your area? Are you in the bush at the moment? Have you been to the sites where the pumps have 'failed'? If you have been to the boreholes, do you know the borehole designs, construction details, water levels and pump intake depths? There are many reasons why a pump has been described as 'failed'. A common technical reason for a pump to fail is that someone misguided has decided to put the pump at the bottom of the borehole, rather inside the 'pump chamber casing' and carrying out a pumping test to determine the drawdown at a particular yield. Then using this information to choose the appropriate depth to set the final production pump. Relatively young, high quality pumps (such as Grundfos) usually don't fail in a short period of time, if they have been put in the right position in a properly constructed borehole and operated properly. Your assessment of the pump problem and the boreholes may give you good information that enables you to appropriately modify your borehole designs before you start drilling new holes. David

Chris Chris

Your question raises many questions. questions.

I have worked in Mali but my experience may not be relevant relevant

It may be appropriate to find out the reason for the problems with the existing pumps before drilling new boreholes or ordering new pumps pumps

Which part of northern Mali is your area? area?

Are you in the bush at the moment?

Have you been to the sites where the pumps have 'failed'? 'failed'?

If you have been to the boreholes, do you know the borehole designs, construction details, water levels and pump intake depths? depths?

There are many reasons why a pump has been described as 'failed'. 'failed'.

A common technical reason for a pump to fail is that someone misguided has decided to put the pump at the bottom of the borehole, rather inside the 'pump chamber casing' and carrying out a pumping test to determine the drawdown at a particular yield. Then using this information to choose the appropriate depth to set the final production pump. pump.

Relatively young, high quality pumps (such as Grundfos) usually don't fail in a short period of time, if they have been put in the right position in a properly constructed borehole and operated properly. properly.

Your assessment of the pump problem and the boreholes may give you good information that enables you to appropriately modify your borehole designs before you start drilling new holes. holes.

David